You keep arguing that people know what Autopilot on planes really does, and therefore wouldn't make the mistake of assuming Tesla's AP is anything but straight-and-level in a car.
Yet, we're commenting on yet another news story where a driver has ended up in a prang whilst doing something that's best explained by a belief that Autopilot would handle things for him. And not the worst example of it, at that.
You're arguing semantics whilst ignoring what's happening in the real world - if you're not capable of observing the real-world effects, why are you so convinced that the average joe public is sufficiently capable of observation to know what a plane's autopilot actually does?
To answer your reductio-ad-absurdum though, yes the passengers would likely object. But, how can you tell whether that objection is because they know what autopilot actually is, or because they perceive the crew as being there to respond to serious emergencies (which they can't do if they're pissed)?